<span> white blood cells tend to have a higher surface to volume ratio then other cells because the are more amorphous</span>
In biology, the inner lining of tubular structures is called a lumen.
This can refer to numerous tubular structures in the body, such as the lumen of the veins and arteries, the lumen of the intestines or the tubes in the kidneys.
This term can also be used to describe a space defined by membranes of cell organelles such as the lumen of the mitochondria, the Golgi apparatus, and others.
Answer:
A published opinion with supporting evidence.
Transports salt into the ocean.
